"When some one posts a picture of a tree after it has been chopped, defoliated, styled, or severely insulted on the top, or at the bottom, or both, and then asks if it would be OK, don't say anything until you see the before picture of the tree & of the soil etc.. Until I can estimate how much of an energy reserve the tree had, I am not going say anything. I've learned the hard way that in a lot of cases, the tree is dead, even though the owner doesn't see it yet."
Everything you say makes a lot of sense. Your paragraph above is a great description of what I call "bonsai demonstration syndrome". A visiting expert comes to a club meeting and does a "demonstration" in which a lot of drastic work is done to nursery stock or maybe a pre-bonsai. Styling, major branch and root pruning, wiring, repotting into a small bonsai pot, all in an hour and a half. Often the tree is raffled or given in a random drawing, sometimes to a beginner (like me). The transformation is astounding! From raw material a bonsai is created in front of our own eyes!
A few weeks or months later the tree dies.